package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.webSocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Transactional
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;

    /*
     * 用户下单
     * */
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //处理业务异常
        //1地址普为空
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //2购物车为空
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(BaseContext.getCurrentId());
        orderMapper.insert(orders);

        //向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();//订单明细

            BeanUtils.copyProperties(cart, orderDetail);

            orderDetail.setOrderId(orders.getId());//设置订单明细关联的订单id

            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //清空购物车
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
        //封装vo对象
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();


        return orderSubmitVO;
    }

    /*
     * 查询历史订单
     * */
    @Transactional
    public PageResult list(OrdersPageQueryDTO ordersPageQueryDTO) {

        //开始分页查询
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());


        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        if (page != null && page.size() > 0) {

            for (Orders orders : page) {

                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

                OrderVO orderVO = new OrderVO();

                BeanUtils.copyProperties(orders, orderVO);

                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);

            }


        }


        return new PageResult(page.getTotal(), list);
    }

    /*
     * 查询订单详情
     * */
    @Transactional
    public OrderVO selectDetail(Long id) {

        //todo
        OrderVO orderVO = new OrderVO();

        Orders orders = orderMapper.selectById(id);
        List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(id);

        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetails);


        return orderVO;
    }

    /*
     * 用户取消订单
     * */
    public void cancel(Long id) throws Exception {
        /**
         * 订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
         *待支付和待接单状态下，用户可直接取消订单
         * - 商家已接单状态下，用户取消订单需电话沟通商家
         * - 派送中状态下，用户取消订单需电话沟通商家
         * - 如果在待接单状态下取消订单，需要给用户退款
         * - 取消订单后需要将订单状态修改为“已取消”
         *
         */

        //先查询订单
        Orders orders = orderMapper.selectById(id);
        // 校验订单是否存在
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //判断订单状态
        if (orders.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //待支付状态下，用户可直接取消订单
        if (orders.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    orders.getNumber(), //商户订单号
                    orders.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);


    }

    /*
     * 再来一单
     * */
    @Transactional
    public void again(Long id) {
        //- 再来一单就是将原订单中的商品重新加入到购物车中

        //根据订单id查询订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();//一个购物车只能装一个菜品或套餐

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);


    }

    /*
     * 订单搜锁
     * */
    @Transactional
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {


        /*- 输入订单号/手机号进行搜索，支持模糊搜索
                - 根据订单状态进行筛选
                - 下单时间进行时间筛选
                - 搜索内容为空，提示未找到相关订单
                - 搜索结果页，展示包含搜索关键词的内容
                - 分页展示搜索到的订单数据*/

        //开始分页查询
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());


        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);


        return new PageResult(page.getTotal(), orderVOList);

    }


    private List<OrderVO> getOrderVOList(Page<Orders> page) {

        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;

    }


    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }


    /*
     * 各个状态订单的数量统计
     * */
    public OrderStatisticsVO statistics() {

        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        // 将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /*
     * 查询订单详情
     * */
    public OrderVO details(Long id) {
        /*
        * 订单详情页面需要展示订单基本信息（状态、订单号、下单时间、收货人、电话、收货地址、金额等）
        - 订单详情页面需要展示订单明细数据（商品名称、数量、单价）
        * */

        Orders orders = orderMapper.selectById(id);

        List<OrderDetail> byOrderId = orderDetailMapper.getByOrderId(id);

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(byOrderId);

        return orderVO;
    }

    /*
     * 接单
     * */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }

    /*
     * 拒单
     * */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        /*- 商家拒单其实就是将订单状态修改为“已取消”
        - 只有订单处于“待接单”状态时可以执行拒单操作
                - 商家拒单时需要指定拒单原因
                - 商家拒单时，如果用户已经完成了支付，需要为用户退款*/
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);

    }

    /*
     * 商家取消订单
     * */
    public void cancelOrder(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == 1) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /*
     * 派送订单
     * */
    public void delivery(Long id) {

        //- 派送订单其实就是将订单状态修改为“派送中”
        //- 只有状态为“待派送”的订单可以执行派送订单操作
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);


    }

    /*
     * 完成订单
     * */
    public void complete(Long id) {
        //- 完成订单其实就是将订单状态修改为“已完成”
        //- 只有状态为“派送中”的订单可以执行订单完成操作

        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /*
     * 用户催单
     * */
    public void reminder(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Map map = new HashMap();

        map.put("type", 2);
        map.put("orderId", id);
        map.put("content", "订单号" + ordersDB.getNumber());

        webSocketServer.sendToAllClient(JSON.toJSONString(map));

    }

}
